hey,
I'm not sure about other states but in WA the teacher in preschool and kindy ( the 2 years before yr1) asses the children in the classroom and are very quick to refer and child that needs it.
My DS was sent to the speach Patholigist as the teacher thought he may need it but it turns out there was nothing wrong. I guess what i am trying to say is even if his mother/ father do not want to admit there is a problem the teacher should pick it up!